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Organization and Nature of Operations (Narrative) (Details)
Dec. 31, 2018
TelevisionStation
Category
Education [Member]  
Product Information [Line Items]  
Number of education business categories | Category 4
Television Broadcasting [Member]  
Product Information [Line Items]  
Number of television broadcast stations owned 7
JacksonvilleFL [Member] | Television Broadcasting [Member]  
Product Information [Line Items]  
Number of television broadcast stations owned 2